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Second-generation over-the-counter medications like Claritin, Zyrtec, and Allegra - which improve upon old options like Benadryl by not putting you to sleep - are more similar than they are different. You just have to answer a couple of basic questions to figure out which to choose. Of course, it is always a good idea to talk to your doctor before trying any new medication. Do you need a decongestant. If you're shopping for allergy medication, we'll assume your eyes are itchy, your nose is running, and you can't stop sneezing. But if you can still breathe through your nose, proceed to Step 2.